CN111958012B - Method for guaranteeing precision of shaft coupling and shaft hole boring - Google Patents
Method for guaranteeing precision of shaft coupling and shaft hole boring Download PDFInfo
- Publication number
- CN111958012B CN111958012B CN202010829653.6A CN202010829653A CN111958012B CN 111958012 B CN111958012 B CN 111958012B CN 202010829653 A CN202010829653 A CN 202010829653A CN 111958012 B CN111958012 B CN 111958012B
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- shaft
- hole
- boring
- alignment section
- positioning hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
The invention discloses a method for ensuring the precision of a coupling and a boring shaft hole. The method is suitable for accurately processing the coupling positioning hole of the hydroelectric generating set with long positioning size section and large coupling flange thickness. After coupling, positioning and aligning the section by boring the coupling positioning hole together, firstly ensuring the accurate position of the coupling hole positioning section, and then detaching the two shafts for respectively processing the single shaft; during single-shaft machining, the boring holes are aligned according to the flange faces and the alignment sections with determined positions, the size precision and form and position tolerance of each boring hole are guaranteed, and the boring hole precision is approved respectively through single parts and assembly after fine boring. The invention shortens the overhanging of the processing tool, reduces the equipment stroke, reduces the overhanging deflection deviation of the tool and the precision deviation of a machine tool, improves the manufacturing precision, reduces the configuration of high-precision tools and high-precision equipment, saves the manufacturing cost, and has the advantages of convenient process operation, reliable precision and the like.
Description
Technical Field
The invention relates to the field of hydroelectric generating sets, in particular to a method for guaranteeing the precision of shaft holes of a coupling and a boring machine.
Background
The water turbine shaft and the generator shaft of the water turbine generator set are high-precision rotating parts of the hydropower station, and the coupling precision of the water turbine generator set is related to the stable operation and the service life of the set. In the manufacturing process of the water turbine shaft and the generator shaft, the water turbine shaft and the generator shaft are generally subjected to independent finish machining in a sleeping car, and certain technical measures are needed to be adopted on the premise of confirming that the shafting assembly is coaxial, so that the hole combination relative position degree and the hole boring precision of the two coupling shafts are ensured, the accurate assembly in a construction site is facilitated, and the stable operation of a unit is ensured.
The precision requirement of the connecting positioning holes of the water turbine shaft and the generator shaft is high, and certain requirements are met for the precision of equipment and a cutter for machining. When the size of the positioning hole of the shaft hole is long or the thickness of the shaft flange is large, the equipment stroke is large during machining, the overhang of the cutter is long, and large machining deviation can be generated during machining or the boring precision is poor due to cutter vibration.
The process method has the advantages that under the condition that no extra high-precision cutter is manufactured or high-precision machine tool equipment is equipped, the shaft hole positioning and aligning section is reasonably converted twice, the relative position is determined firstly, then the machining precision is independently ensured, and the position is checked again, so that the boring precision is ensured, the precision requirements on the machining cutter and the machining equipment are reduced, the shaft hole is machined conveniently, and the aim of reducing the manufacturing cost is fulfilled.
Disclosure of Invention
The invention discloses a process method for ensuring the precision of a coaxial boring shaft hole after shaft coupling in a factory in the manufacturing process of a hydroelectric generating set.
The process method has the advantages that through reasonable conversion of the positioning and aligning section, the process method that the position of the relative shaft hole is determined firstly, then the shaft hole is processed independently, and the position is approved again to ensure the processing precision of the shaft hole is adopted, so that the precision requirements on processing cutters and equipment are reduced, the shaft hole is convenient to process and manufacture, and the purposes of meeting the design precision requirements and reducing the manufacturing cost are achieved.
The technical scheme of the invention is as follows:
1) a single finely turned water turbine shaft (1) and a single finely turned generator shaft (2) are assembled and combined together by a combining bolt (3); assembling a bolt (3) in a first positioning hole (4) roughly bored by a water turbine shaft and a second positioning hole (5) roughly bored by a generator shaft; the bolt joints (3) are uniformly distributed and assembled by separating one hole according to the pitch circle of the shaft hole distribution;
2) after the two shaft couplings are assembled, checking the coaxiality of the couplings in a horizontal lathe, and after the coaxiality of the couplings is qualified, hanging down the horizontal lathe and horizontally placing the horizontal lathe on a boring machine platform;
3) aligning according to the flange back (9) of the generator shaft (2) by using a boring mill angle milling head (6), and respectively boring an alignment section M and an alignment section N by using a long boring rod (7) at the width distances of 20mm from the front to the back of a legal flange surface (8) of a first positioning hole (4) and a second positioning hole (5) of each shaft hole;
4) respectively boring an alignment section M and an alignment section N at the positions of a first positioning hole (4) of a coupling shaft without assembling a handle bolt and a flange surface (8) of a handle bolt without assembling a handle bolt by a width distance of 20mm in front and back according to the method of the step 3);
5) reversing the handle bolt (3) and assembling the handle bolt in the shaft hole of the bored alignment section;
6) respectively boring an alignment section M and an alignment section N at the positions of a coupling first positioning hole (4) and a coupling flange surface (8) of a second positioning hole (5) which are not provided with a handle bolt (3) by a width distance of 20mm in front and back according to the method in the step 3);
7) disassembling the two shafts, respectively aligning a workpiece according to a legal flange surface (8) of a water turbine shaft (1) and a generator shaft (2), aligning a short boring rod (14) according to a machined positioning hole alignment section M and an alignment section N, boring an alignment section P and an alignment section Q at the positions of a first guide hole (10) and a second guide hole (11) of each shaft hole, enabling the alignment section P and the alignment section M to be as close as possible, enabling the concentricity to be smaller than 0.02mm, enabling the alignment section Q and the alignment section N to be as close as possible, and enabling the concentricity to be smaller than 0.02 mm;
8) after the shaft holes are qualified, finely boring a first positioning hole (4) and a second positioning hole (5) of the shaft according to a short boring rod (14) arranged on an alignment section M and an alignment section N on an alignment milling head (15);
9) after the first positioning hole (4) and the second positioning hole (5) of each shaft hole are machined, the concentricity between each shaft hole and the first positioning hole (4) and the concentricity between each shaft hole and the second positioning hole (5) are respectively rechecked according to the alignment section P and the alignment section Q, after the concentricity is qualified, the alignment is carried out according to the first positioning hole (4) and the second positioning hole (5), and the parts of the first guide hole (10) and the second guide hole (11) of each shaft hole are machined until all coupling holes are machined;
10) after all shaft holes of the two shafts are respectively processed, the assembling bolts (3) are assembled in a coupling way, and the assembling bolts (3) are uniformly distributed and assembled in a circle at intervals of one hole according to the shaft holes;
11) trial assembly of the product positioning pins is conducted on the first positioning hole (4) and the second positioning hole (5) of each shaft hole, the handle bolt (3) is reversed, and assembly and post-assembly approval are conducted on boring accuracy.
Technical effects
The invention processes the position alignment section of the positioning holes of the two shafts in advance in the coupling assembly state instead of processing the length of the whole positioning hole in one step according to the conventional method, and because the length of the alignment section relative to the positioning hole is small, the precision deviation of the equipment and the cutter in a short distance stroke is small, the relative position degree of the positioning holes of the two shafts and the position precision of the coupling positioning hole are easily ensured to be high;
the two shafts are disassembled for processing, the two shaft flanges are used for aligning the workpiece on the joint surface, and the alignment and processing operation is easier than that of the flange on the back surface due to no influence of the shaft body;
the large shaft is aligned according to the machined positioning alignment section, the distance between the thickness of a shaft flange and the stroke of a machining tool and equipment is reduced, the boring machining can be completed by using the relatively shortened tool and equipment stroke, the tool and the equipment boring shaft cannot be influenced by large overhang deflection, the vibration is small during machining, and the machining efficiency and the machining precision of the positioning hole can be effectively improved;
the method utilizes different positions of the shaft hole of the workpiece to switch the positioning section, ensures that the position precision is not lost, effectively approves the position precision of the positioning hole, and ensures the machining precision of the shaft hole to be reliable by assembling and confirming again after the shaft coupling is assembled.
The invention is particularly suitable for boring processing with long dimension of the coupling positioning hole and large thickness of the coupling flange, and the process method can meet the requirement of the mounting precision of the coupling in a construction site.
Drawings
FIG. 1 is a schematic view of a water turbine and generator shaft coupling assembly
FIG. 2 is a schematic view of a partial bore hole of a water turbine shaft and a generator shaft
Detailed Description
1) The finish turning of the single water turbine shaft 1 and the generator shaft 2 is qualified, the parallelism between the flange surface 12 of the water turbine shaft 1 and the legal flange surfaces 8 of the two shafts is not more than 0.03mm after finish turning, and the parallelism between the flange back surface 9 of the generator shaft 2 and the legal flange surfaces 8 of the two shafts is not more than 0.03mm after finish turning;
2) the two shafts are assembled and combined together by the bolts 3, the gap between the legal flange surfaces 8 is less than 0.02mm, the bolts 3 are uniformly assembled at intervals of one hole according to the pitch circles distributed in the shaft holes, the torque is uniform, and the structure is shown in figure 1;
3) after the two shaft couplings are assembled, checking the coaxiality of the shaft couplings in a sleeping car, and after confirming that the coaxiality meets the IEEE810 standard, hanging down the sleeping car and then laying on a boring machine platform;
4) on the boring mill angle milling head 6, a dial indicator 13 is mounted, see fig. 1. Aligning according to the flange back 9 of the generator shaft, adjusting a coupling assembly body, and counting a circle on the end face of a shaft hole 11 by no more than 0.02mm to ensure that the long boring bar 7 is vertical to the flange back 9;
5) respectively boring an alignment section M and an alignment section N in the front and back 20mm widths of a legal flange surface 8 of a first positioning hole 4 and a second positioning hole 5 of two coupling shafts by using a long boring rod 7, wherein the roughness of the round surface is not lower than Ra3.2um;
6) respectively boring an alignment section M and an alignment section N in a first positioning hole 4 and a second positioning hole 5 of a coupling shaft of the unassembled joint bolt 3 according to the step 4) and the step 5);
7) reversing the handle bolt 3, assembling the handle bolt in the shaft hole of the machined alignment section, and boring the alignment section M and the alignment section N in the first positioning hole 4 and the second positioning hole 5 of the coupling shaft of the unassembled handle bolt 3 according to the steps 4) and 5);
8) the two shafts are disassembled, and the hole combination is marked with the corresponding hole number before the two shafts are disassembled;
9) the workpiece is aligned according to the legal flange surfaces 8 of the water turbine shaft 1 and the generator shaft 2 respectively, as shown in figure 2. Finding the flange surface 8 to be vertical to the short boring bar 14 by using a dial indicator 13, uniformly distributing the flange surface 8 at eight points in a circle, wherein the point deviation is not more than 0.02 mm;
10) after the workpiece is aligned to be qualified, the dial indicator 13 is used for respectively aligning the short boring bar 14 on the milling head 15 according to the processed alignment section M and the alignment section N, and one circle of the alignment section is not more than 0.02 mm. Respectively processing an alignment section P and an alignment section Q at the positions of a first guide hole 10 and a second guide hole 11 of each shaft hole, wherein the distance between the alignment section P and the alignment section M is as close as possible, the concentricity is not more than 0.02mm, the distance between the alignment section Q and the alignment section N is as close as possible, and the concentricity is not more than 0.02 mm;
11) a dial indicator 13 is used for marking a circle according to the alignment section M and the alignment section N respectively, aligning the short boring bar 14, the circle of the marking alignment is not more than 0.02mm, and then the short boring bar 14 on the straight milling head 15 is used for precisely boring the first positioning hole 4 and the second positioning hole 5 of the shaft respectively;
12) after the first positioning hole 4 and the second positioning hole 5 of the two shafts are machined, the concentricity of the first positioning hole 4 and the second positioning hole 5 of the precisely bored shaft holes is rechecked according to the alignment section P and the alignment section Q, the position degree deviation after the first positioning hole 4 and the second positioning hole 5 are bored is confirmed, and the centering is performed for one circle by drawing a table, wherein the diameter of the circle is not more than 0.02 mm;
13) respectively performing surface centering according to the finely bored first positioning hole 4 and the second positioning hole 5, and processing the parts of a first guide hole 10 and a second guide hole 11 of the shaft hole;
14) processing the rest shaft holes according to the steps 10) to 13) until all shaft coupling holes of each shaft are processed;
15) after all shaft holes of the two shafts are processed, the shaft holes are recombined and assembled, the bolts 3 are assembled, the gap between the flange surfaces 8 is checked and is not more than 0.02mm, and the bolts (3) are uniformly assembled at intervals of one hole according to the pitch circle of the shaft holes, as shown in figure 1;
16) trial assembly of the product positioning pins is performed on the first positioning hole 4 and the second positioning hole 5 of the shaft hole, the handle bolt 3 is reversed, and assembly approval is performed on the machining precision of each boring hole.
By finishing the process content, the co-boring machining precision of the shaft hole of the coupling is realized, and the mounting requirement of the coupling in a construction site is finally ensured.
Equipment is needed:
tool handle bolt (component)
Angular milling head
Straight milling head
Long boring bar
Short boring bar
Dial indicator
Numerical control boring machine
Others (axle support, etc.)
Claims (1)
1. A method for ensuring the precision of shaft coupling and shaft boring holes is characterized by comprising the following steps:
1) two shafts of a single finely turned water turbine shaft (1) and a single generator shaft (2) are assembled, fastened and fixed in a first positioning hole (4) roughly bored in the water turbine shaft and a second positioning hole (5) roughly bored in the generator shaft through fastening bolts (3); the bolt combining (3) is evenly distributed and assembled according to the whole circle of the shaft hole at intervals of one hole;
2) after the two shaft couplings are assembled, checking the coaxiality of the coupling assembly body in a horizontal lathe, confirming that the coaxiality of the coupling is qualified, and after the coupling assembly body is hung off the horizontal lathe, horizontally placing the coupling assembly body on a boring machine platform;
3) an angle milling head (6) of the boring machine is aligned according to the back surface (9) of a flange of a finely machined generator shaft (2), and an alignment section M and an alignment section N are respectively bored in a first positioning hole (4) and a second positioning hole (5) of a coupling by using a long boring rod (7);
4) respectively boring an alignment section M and an alignment section N in a first positioning hole (4) and a second positioning hole (5) of a coupling shaft which is not provided with a handle bolt (3) by using a long boring rod (7) in sequence;
5) reversing the handle bolt (3) and assembling the handle bolt in the shaft hole of the bored alignment section;
6) an angle milling head (6) of the boring machine is aligned according to the back surface (9) of a flange of a finely-machined generator shaft (2), and an alignment section M and an alignment section N are respectively bored in a first positioning hole (4) and a second positioning hole (5) of a coupling shaft which is not provided with a handle bolt (3) by a long boring rod (7);
7) disassembling the two shafts, respectively aligning a workpiece according to a legal flange surface (8) of a water turbine shaft (1) and a generator shaft (2) which are subjected to finish machining, and processing an alignment section P and an alignment section Q at the positions of a first guide hole (10) and a second guide hole (11) of each shaft hole according to a short boring rod (14) arranged on an alignment milling head (15) of a processed alignment section, so that the alignment section P and the alignment section M are close to and concentric as much as possible, and the alignment section Q and the alignment section N are close to and concentric as much as possible;
8) aligning the short boring rods (14) on the straight milling head (15) according to each shaft hole alignment section M and each alignment section N respectively, and finely boring the first positioning hole (4) and the second positioning hole (5) after the short boring rods are qualified;
9) after the first positioning hole (4) and the second positioning hole (5) of each shaft hole are finely machined, the concentricity of the first positioning hole (4) and the second positioning hole (5) is rechecked according to the alignment section P and the alignment section Q of the shaft hole, and after the concentricity is qualified, the first positioning hole (4) and the second positioning hole (5) are respectively aligned to machine the first guide hole (10) and the second guide hole (11) of the shaft hole;
10) after all shaft holes of the two shafts are respectively processed, assembling the joint bolts (3) again for shaft coupling assembly, and assembling the joint bolts (3) according to the whole circle and uniformly distributed in every other hole of the shaft holes;
11) trial-assembling the product positioning pin in the first positioning hole (4) and the second positioning hole (5) of the shaft hole, reversing the handle-closing bolt (3), and assembling and then approving the boring hole precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010829653.6A CN111958012B (en) | 2020-08-18 | 2020-08-18 | Method for guaranteeing precision of shaft coupling and shaft hole boring |
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| CN202010829653.6A CN111958012B (en) | 2020-08-18 | 2020-08-18 | Method for guaranteeing precision of shaft coupling and shaft hole boring |
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| CN111958012A CN111958012A (en) | 2020-11-20 |
| CN111958012B true CN111958012B (en) | 2022-07-12 |
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